It is fairly simple to use the easyDNS Mac OSX Dynamic DNS Client with your account on ZoneEdit. You'll first want to download one of the following Dynamic DNS client:
OSX 10.7 and above
Once you've downloaded and installed the client, you'll want to do the following:
1. Find the client you've just installed under your Applications folder
2. Right click and select SHOW PACKAGE CONTENTS
3. Click on CONTENTS, RESOURCES, then ENGLISH.LPROG
4. Double click DEFAULT PREFERENCES.PLIST
5. Change the string EASYDNS (below RSP IDENTITY) to ZONEEDIT
6. Change the URL API.CP.EASYDNS.COM to API.CP.ZONEEDIT.COM (or DYNAMIC.ZONEEDIT.COM)
7. Restart your client